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Distribution, Identity and Putative Function of Fibroblast Growth Factor 10 Expressing Cells in the Developing and Adult Mouse Brain

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Distribution, Identity and Putative Function of Fibroblast Growth Factor 10 Expressing Cells in the Developing and Adult Mouse Brain Distribution, identity and putative function of fibroblast growth factor 10 expressing cells in the developing and adult mouse brain A thesis submitted to the University of East Anglia for the degree of Doctor of Philosophy by Niels Haan April 2012 This copy of the thesis has been supplied on condition that anyone who consults it is understood to recognise that its copyright rest with the author and that no quotation from the thesis, not any information there from may be published without the author’s prior written consent. Abstract Neural stem cells in the adult mammalian brain have been extensively studied and well characterised. However, apart from the classical stem cell niches of the lateral ventricle and the hippocampus, other brain areas, including the hypothalamus and amygdala, are potential novel stem cell niches. These areas have previously been found to express fibroblast growth factor 10 (Fgf10), known to maintain stem cell niches in other tissues. Here the hypothalamus and amygdala are investigated as potential novel neural stem cell niches, and the possibility of the olfactory bulb as the target of a putative migratory stream from the amygdala is assessed. Using a combination of immunohistochemistry, BrdU incorporation assays, genetic lineage tracing and in vitro cultures, the properties of Fgf10 expressing cells were examined. The Fgf10 expressing cells of the hypothalamus, the tanycytes, were found to express stem cell markers, and are capable of division in vivo. This stem cell niche was found to be generated during development and continues to be present into adulthood. Although proliferation is highest in the early post-natal period, it continues into later life. The Fgf10+ lineage is able to generate neurons and glia both in vivo and in vitro. Given the location of newly generated Fgf10+ lineage derived neurons in the hypothalamus, a function in control of energy balance seems likely. In contrast, in the amygdala Fgf10+ cells do not appear to be stem cells, but mostly mature neurons. These do not express neural stem cell markers or incorporate BrdU. In the olfactory bulb, the majority of Fgf10+ cells, which are found in all layers, are mature neurons, of both a glutamatergic and GABAergic phenotype. Although the function of Fgf10 in these brain areas is as yet unknown, it marks a diverse population of cells, and is a candidate molecule to fulfil a number of different functions in these cells. 2 Acknowledgements First and foremost I must thank my supervisor, Mohammad K Hajihosseini for continued advice and support and for pushing me to achieve a great deal in my three years in Norwich. My secondary supervisors, Grant Wheeler and Uli Mayer, provided much useful input to my project. I am grateful to the Anatomical Society of Great Britain and Ireland for providing the funding for this project. In the lab, I must thank my Alaleh Najdi-Samiei for trustworthy and speedy genotyping and for making sure we always had ample supplies of anything we could think off, Christina Stratford and Irina Djacova for always being fun to be with and always willing to listen to me rant. Special thanks goes out to Timothy Goodman for being a good colleague, sounding board and for injecting what must at times have seemed millions of mice. Both in and out of the lab you have been great people to be with. I couldn’t have asked for better people to work with. Outside the UEA I sincerely thank Dr Saverio Bellusci for the Fgf10CreERT2 mouse line, and Dr Natalie Bronstein for the custom Fgf10 antibody. I would like to thank the Wheeler and Münsterberg lab members for never looking too bored during my lab meetings, and for always being fun company outside of the lab. The microscope support received from Paul Thomas and Alba Warn has always been useful. Special thanks goes out to the staff of the DMU, present and former, Simon Deakin, Rich Croft and Donna Hinds, for animal maintenance. In the BMRC I would like to single out the Mogensen lab for special thanks, for putting up with me continuously using their Western equipment and for much help, support and company. The rest of the people in the BMRC, former and present, have always been good friends and colleagues, and always put up with me asking to ‘borrow’ things or annoying them with small talk and gossip when trying to avoid doing work. I hope I have on occasion been useful in return as well. I must thank my parents and grandfather for financial support and apologize for seriously neglecting them whilst being all too busy in distant England. My greatest thanks go out to Jenny, Rob and Sally, for being the best friends, drinking buddies, and support group I could have wished for. I couldn’t have done it without you guys. 3 Index Abstract 2 Acknowledgments 3 Index 4 List of figures 8 List of tables 10 Chapter 1 – Introduction 11 1.1 – Adult neural stem cells 12 1.2 – Origin of adult neural stem cells 12 1.3 – Canonical niches for adult neural stem cells 14 1.3.1 Subventricular zone of the lateral ventricle 14 1.3.2 Subgranular zone of the dentate gyrus 17 1.4 – Potential new niches for adult neural stem cells 18 1.5 – Selfrenewal of adult neural stem cells 19 1.6 – Neuroblast migration 21 1.7 – Differentiation of neural stem cells 24 1.8 – Fibroblast growth factors 26 1.9 – Fgf receptors 26 1.10 – Fgf expression and function in the developing and adult nervous 30 system 1.10.1 Fgf1 subfamily (Fgf1 and 2) 30 1.10.2 Fgf4 subfamily (Fgf4, 5 and 6) 31 1.10.3 Fgf7 subfamily (Fgf3, 7, 10 and 22) 31 1.10.4 Fgf8 subfamily (Fgf8, 17 and 18) 32 1.10.5 Fgf9 subfamily (Fgf9, 16 and 20) 32 1.10.6 iFgf subfamily (Fgfs 11-14) 33 1.10.7 hFgf subfamily (Fgfs 15/19, 21 and 23 33 1.11 – Fgf10 34 1.12 – Fgf10 knockouts 34 1.13 – Mutations in Fgf10 and disease in humans 35 1.14 – Roles of Fgf10 in tissue development. 35 1.14.1 Lung 36 1.14.2 Stomach 37 1.14.3 Pancreas 37 1.14.4 Limbs 38 1.14.5 Adipose tissue 38 1.14.6 Teeth 39 1.14.7 Small intestine 39 1.14.8 Liver 39 1.15 – Expression and functions Fgf10 in the brain 40 1.16 – Aims 43 4 Chapter 2 – Materials and methods 45 2.1 – Mouse lines 46 2.1.1 Fgf10lacZ 46 2.1.2 NestincreERT2 46 2.1.3 Fgf10creERT2 46 2.1.4 ROSA26YFP/ROSA26RFP/ROSA26LacZ 48 2.1.5 Fgf10 KO 48 2.1.6 Fgf10CreERT2::ROSA26Tomato 48 2.6.7 Breeding and genotyping 48 2.2 - Animal treatments 50 2.2.1 Time mating 50 2.2.2 BrdU administration 50 2.2.3 Tamoxifen administration 50 2.3 - Tissue processing 50 2.4 - Sectioning 51 2.5 - Immunohistochemistry 52 2.5.1 Antigen retrievals 52 2.5.2 Cryostat section staining 53 2.5.3 Vibratome section staining 54 2.6 - Cell culture 56 2.6.1 Culture surface coatings 56 2.6.2 Neurosphere culture 57 2.6.3 Primary neurons 59 2.6.4 Primary astrocytes 59 2.6.5 Cell lines 60 2.6.6 Xgal staining on cells 60 2.7 - Immunocytochemistry 60 2.8 - Microscopy 61 2.9 - Flow cytometry 61 2.10 – Reverse transcriptase PCR 62 2.10.1 Sample preparation 62 2.10.2 RT-PCR 63 2.11 - Western blot 64 2.11.1 Sample preparation 64 2.11.2 SDS-PAGE and transfer 64 2.11.3 Detection 65 2.11.4 ECL detection 66 2.11.5 Quantification 66 2.12 Statistical analysis 66 Chapter 3 – Optimisation of detection of FGF10 protein in 67 immunohistochemistry and Western blot 3.1 – Introduction 68 3.2 – Results 70 3.2.1 Commercial anti-FGF10 antibodies do not work in 70 immunohistochemistry 3.2.2 Custom anti-FGF10 does not appear to be specific for FGF10 70 3.2.3 Custom anti-FGF10 does detect Fgf10 in western blot, but is 71 not specific 5 3.2.4 Specificity can be somewhat improved using 74 unconventional blotting techniques 3.2.5 Custom antibody may be used for quantification of FGF10 77 protein levels 3.3 Discussion 78 Chapter 4 - Distribution and phenotype of Fgf10-lacZ expressing cells in the 80 developing and adult hypothalamus 4.1 – Introduction 81 4.2 – Results 85 4.2.1 Fgf10-lacZ positive population is dynamic over time. 85 4.2.2 Fgf10-lacZ positive cells are located across the adult 85 hypothalamus 4.2.3 Fgf10-lacZ expressing cells are located mostly in the arcuate 88 nucleus 4.2.4 A heterogeneous population of tanycytes expresses neural 88 stem cell markers 4.2.5 Fgf10-lacZ positive cells express FgfR1-IIIc and 3-IIIc, but not 91 FgfR2 or FgfR4 4.2.6 Expression pattern of Fgf10-lacZ is largely set up before 93 birth 4.2.7 The Fgf10 expressing lineage contributes to embryonic 96 hypothalamic neurogenesis. 4.2.8 Fgf10-lacZ+ cells contribute neurons and glia to the 96 hypothalamic parenchyma 4.3 - Discussion 100 Chapter 5 - In vivo analysis of cell proliferation and genetic lineage tracing in 104 the hypothalamus 5.1 – Introduction 105 5.2 - Results 109 5.2.1 Ki67 labeling shows limited proliferation in the adult 109 hypothalamus 5.2.2 Cumulative BrdU administration shows widespread 109 proliferation, including a subset of Fgf10-lacZ+ cells 5.2.3 Both total and Fgf10-lacZ expressing BrdU incorporating 112 populations decrease with age 5.2.4 Majority of Fgf10-lacZ+ cells do not divide after cessation of 112 embryonic neurogenesis 5.2.5 Inducible nestinCreERT2 animals are not suitable for adult 115 lineage tracing 5.2.6 Inducible genetic lineage tracing confirms Fgf10 expression 115 in the hypothalamus 5.2.7 Recombined cells do not express glial markers 119 5.2.8 Direct lineage tracing shows Fgf10 expressing cells generate 119 hypothalamic neurons 5.2.9 Embryonic induction of Fgf10CreERT2::ROSA26lacZ animals 119 shows Fgf10 distribution 6 5.1.10 Fgf10CreERT2::Rosa26Tomato mice confirms lineage tracing 123 results 5.1.11 Fgf10CreERT2::Rosa26Tomato mice show more widespread 123 recombination 5.3
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